Ring-a-ding crankshaft

[Robert Leigh]

Would any kind soul be able to post a brief video that demonstrates the sort of sound one might find trying to make a crankshaft ring after being hit?  Not exactly NDT Science but I have several old cranks here and I noticed they all sound the same with neither a Crystal Wineglass ring nor a dull thud.  All cracked or all good?  Dinggggg, Dangg or Donk?  I have an excess of old blocks and crankcases that I need to sort through and am not sure if anything is really worth hanging onto.

Thanks.

Rob

I'm no good at posting pictures of anything, but for the ding etc test I suspend from a loosely fitted flywheel nut, which gives a handy attachment point for Chris's piece of string. If any give a dull thud at that stage it's probably not worth a scientific test. I checked 2 3-bearing shafts recently and the difference was instantly recognisable. One is definitely a dud.
Robert Leigh